METHOD OF MANUFACTURING LOAD-CARRYING GEOPHYSICAL ARMORED CABLE WITH HYDRAULIC CHANNEL Russian patent published in 2024 - IPC F16L11/04 F16L11/14 

FIELD: cable industry.

SUBSTANCE: invention relates to production of load-carrying geophysical armored cable with hydraulic channel for its further use in oil and gas industry. Method involves formation in a multilayer extruder of a liner hydraulic channel with an additional layer of polybutylene terephthalate (PBT) and required parameters of inner diameter and wall thickness. Then the liner hydraulic channel passes through three cooling baths, the first with temperature of not more than 25 °C, the second bath—not more than 40 °C, the third bath—not more than 23 °C, in which the article is cooled to ambient temperature. After cooling baths, liner hydraulic channel passes through pulling device, which performs constant linear movement from extrusion group to receiving device with preset speed from 1 to 10 m/min and pulling force up to 500 kg. After the pulling device, the workpiece is delivered to the receiving device for uniform layer-by-layer arrangement of the workpiece on the process drum. Further, a transverse reinforcing layer is applied in the form of a tape with a small pitch of 5–15 mm by twisting. Longitudinal reinforcing signal-conducting layer is applied successively in two opposite directions in two layers with pitch of 110–200±40 mm for the first layer of the layer with the number of reinforcing elements from 10 to 36 pieces and with pitch of 150–250±40 mm for the second layer of the layer with the number of reinforcing elements from 15 to 36 pieces. Main outer shell of high-density polyethylene (HDPE) is applied using an extrusion line to form bonded layers of a polymer base of a liner hydraulic channel, layers of reinforcing elements and a layer of HDPE due to penetration of HDPE material through layers of reinforcing elements grid, up to polymer base.

EFFECT: invention provides an increase in the radial strength of the cable, reduced stratification of the multilayer structure of the walls, possibility to use working fluids with high temperature factor during downhole operations.

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